How can I log in my alteon2424?

Question

I was given an old alteon 2424.

Pluging a serial cable on the console port allows me to see it booting.

I can choose at boot between 2 images in nvram by pressing ctrl o.

Both images talk about radius login.

I tried to log in using admin/forgetMe! without success.

How can I log in or reset factory default?

Update :

Had no luck with user boot :

Enter radius username: boot
Enter radius password:
RADIUS server timeout.
boot: Sorry.

Is there a physical way to reset nvram?

Update 2:

Found a reset button on the mainboard. Unfotunately, it just reboots the alteon without restoring factory default.

Update 3:

Hitting ctrl c while booting enables entering "Development Mode", but it leads to the same "Enter radius username:". Using ctrl f at boot time does not provide any improvement (some ebay vendors suggests it leads to factory reset).

Update 4:

Searched the web and the main board for a way to reset it to factory default without success.

Update 5:

Hitting ctrl + c + f +t at boot time leads to this :

Loading Image:

Alteon Application Switch 2424
Rebooted because of software PANIC.
Booting complete  9:31:36 Sat Apr 13, 2013:
  Version 21.0.4 from FLASH image1, active config block.


Enter radius username:
Booting ........................................
fgrep: /proc/filesystems: No such file or directory
grep: /proc/mounts: No such file or directory
grep: /proc/mounts: No such file or directory
/etc/init.d/rcS: [: =: unary operator expected
grep: /proc/cmdline: No such file or directory
cat: /proc/cmdline: No such file or directory
sed: can't read tmpfile: No such file or directory
sed: can't read tmpfile: No such file or directory
sed: can't read tmpfile: No such file or directory
sed: can't read tmpfile: No such file or directory
sed: can't read tmpfile: No such file or directory
start-stop-daemon: nothing in /proc - not mounted?

Development Mode

Don't seem to be have all the variables for eth0/inet.
bash-2.04#

Update 6:

I guess I bricked it : I don't have the images and now it won't boot.

bash-2.04# flashboot
Erase Boot Region 0xfff00000Erase Total 2 Units
Performing Flash Erase of length 65536 at offset 0xf10000 done
Write Boot Region 0xfff00000dd: opening `cheetahChtboot.img': No such file or directory
bash-2.04# flashkernel
Erase Kernel Region 0xfff30000Erase Total 8 Units
Performing Flash Erase of length 65536 at offset 0xfa0000 done
Write Kernel Region 0xfff30000dd: opening `cheetahVmlinux.img': No such file or directory
bash-2.04# flashimage1
Erase Image1 Region 0xff800000Erase Total 64 Units
Performing Flash Erase of length 65536 at offset 0xbf0000 done
Write Image1 Region 0xff800000dd: opening `cheetahWebOS.img': No such file or directory